The 25-year-old was grateful for the opportunity, especially as most fellowships are offered to already established writers.
"I am very grateful to Lavinia Winter's whanau, and to New Pacific Studio, for the fellowship. Starting the year with uninterrupted time for writing in a beautiful location is a huge boost, as is the encouragement of having been awarded the fellowship," she said.
Ms Mountier, originally from Christchurch, said she had been able to do more work than she thought and hoped to submit her novel to a publisher before June.
Ms Mountier will be at New Pacific Studio until January 27.